tests: Format all Python code with black, except tests in basics subdir.

This adds the Python files in the tests/ directory to be formatted with
./tools/codeformat.py.  The basics/ subdirectory is excluded for now so we
aren't changing too much at once.

In a few places `# fmt: off`/`# fmt: on` was used where the code had
special formatting for readability or where the test was actually testing
the specific formatting.

tests/float/float_array.py

@@ -7,17 +7,19 @@ except ImportError:
         print("SKIP")
         raise SystemExit
 
+
 def test(a):
     print(a)
     a.append(1.2)
-    print(len(a), '%.3f' % a[0])
+    print(len(a), "%.3f" % a[0])
     a.append(1)
     a.append(False)
-    print(len(a), '%.3f %.3f' % (a[1], a[2]))
+    print(len(a), "%.3f %.3f" % (a[1], a[2]))
     a[-1] = 3.45
-    print('%.3f' % a[-1])
+    print("%.3f" % a[-1])
 
-test(array('f'))
-test(array('d'))
 
-print('{:.4f}'.format(array('f', b'\xcc\xcc\xcc=')[0]))
+test(array("f"))
+test(array("d"))
+
+print("{:.4f}".format(array("f", b"\xcc\xcc\xcc=")[0]))